It's simply a counter that allows an external input to count it up for a period of time. The time base determines the accuracy of the period. The simplest method is to gate the counter for one second, so the count is also the frequency.

It's conventional to latch the count into a register that is connected to the display, and update it every time the gate stops. Or you can display the count for a time, and then count up again, with the displays following the accumulated count.

You'll get extra points for using Dekatron or Nixie tube readouts. The 10 digit vertical neon tube readouts like HP used are uninspired.

This is pretty easy to do. If you have no background at all, Google turns up 135,000 hits on "ttl frequency counter circuits". Do your own and learn something.

No i dont have a big background i am just a beginner and i really would like to see a schematic just to see an overview of what i should do thats all what i'm asking... my question is not to build it or to show the techniques how building it but to study other things!